Question

Out of the number 1 to 100, one is selected at random. What is the probability it is divisible by 7 or 8

Answer 1

numbers divisible by 7 are 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98

numbers divisible by 8 are 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96

so, numbers divisible by 7 or 8 are 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 8, 16, 24, 32, 40, 48, 64, 72, 80, 88, 96

number of numbers divisible by either 7 or 8 is 25

probability = 25/100 = 1/4

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